<?php
class ADODB_pdo_sqlite extends ADODB_pdo {
	var $metaTablesSQL   = "SELECT name FROM sqlite_master WHERE type='table'";
	var $sysDate         = 'current_date';
	var $sysTimeStamp    = 'current_timestamp';
	var $nameQuote       = '`';
	var $replaceQuote    = "''";
	var $hasGenID        = true;
	var $_genIDSQL       = "UPDATE %s SET id=id+1 WHERE id=%s";
	var $_genSeqSQL      = "CREATE TABLE %s (id integer)";
	var $_genSeqCountSQL = 'SELECT COUNT(*) FROM %s';
	var $_genSeq2SQL     = 'INSERT INTO %s VALUES(%s)';
	var $_dropSeqSQL     = 'DROP TABLE %s';
	var $concat_operator = '||';
    var $pdoDriver       = false;
	var $random='abs(random())';
    
	function _init($parentDriver)
	{
		$this->pdoDriver = $parentDriver;
		$parentDriver->_bindInputArray = true;
		$parentDriver->hasTransactions = false;
		$parentDriver->hasInsertID = true;
	}

	function ServerInfo()
	{
		$parent = $this->pdoDriver;
		@($ver = array_pop($parent->GetCol("SELECT sqlite_version()")));
		@($enc = array_pop($parent->GetCol("PRAGMA encoding")));

		$arr['version']     = $ver;
		$arr['description'] = 'SQLite ';
		$arr['encoding']    = $enc;

		return $arr;
	}
	
	function SelectLimit($sql,$nrows=-1,$offset=-1,$inputarr=false,$secs2cache=0) 
	{
		$parent = $this->pdoDriver;
		$offsetStr = ($offset >= 0) ? " OFFSET $offset" : '';
		$limitStr  = ($nrows >= 0)  ? " LIMIT $nrows" : ($offset >= 0 ? ' LIMIT 999999999' : '');
	  	if ($secs2cache)
	   		$rs = $parent->CacheExecute($secs2cache,$sql."$limitStr$offsetStr",$inputarr);
	  	else
	   		$rs = $parent->Execute($sql."$limitStr$offsetStr",$inputarr);

		return $rs;
	}

	function GenID($seq='adodbseq',$start=1)
	{
		$parent = $this->pdoDriver;
		$MAXLOOPS = 100;
		while (--$MAXLOOPS>=0) {
			@($num = array_pop($parent->GetCol("SELECT id FROM {$seq}")));
			if ($num === false || !is_numeric($num)) {
				@$parent->Execute(sprintf($this->_genSeqSQL ,$seq));
				$start -= 1;
				$num = '0';
				$cnt = $parent->GetOne(sprintf($this->_genSeqCountSQL,$seq));
				if (!$cnt) {
					$ok = $parent->Execute(sprintf($this->_genSeq2SQL,$seq,$start));
				}
				if (!$ok) return false;
			}
			$parent->Execute(sprintf($this->_genIDSQL,$seq,$num));

			if ($parent->affected_rows() > 0) {
                	        $num += 1;
                		$parent->genID = intval($num);
                		return intval($num);
			}
		}
		if ($fn = $parent->raiseErrorFn) {
			$fn($parent->databaseType,'GENID',-32000,"Unable to generate unique id after $MAXLOOPS attempts",$seq,$num);
		}
		return false;
	}

	function CreateSequence($seqname='adodbseq',$start=1)
	{
		$parent = $this->pdoDriver;
		$ok = $parent->Execute(sprintf($this->_genSeqSQL,$seqname));
		if (!$ok) return false;
		$start -= 1;
		return $parent->Execute("insert into $seqname values($start)");
	}

	function SetTransactionMode($transaction_mode)
	{
		$parent = $this->pdoDriver;
		$parent->_transmode = strtoupper($transaction_mode);
	}

	function BeginTrans()
	{	
		$parent = $this->pdoDriver;
		if ($parent->transOff) return true; 
		$parent->transCnt += 1;
		$parent->_autocommit = false;
		return $parent->Execute("BEGIN {$parent->_transmode}");
	}
	
	function CommitTrans($ok=true) 
	{ 
		$parent = $this->pdoDriver;
		if ($parent->transOff) return true; 
		if (!$ok) return $parent->RollbackTrans();
		if ($parent->transCnt) $parent->transCnt -= 1;
		$parent->_autocommit = true;
		
		$ret = $parent->Execute('COMMIT');
		return $ret;
	}
	
	function RollbackTrans()
	{
		$parent = $this->pdoDriver;
		if ($parent->transOff) return true; 
		if ($parent->transCnt) $parent->transCnt -= 1;
		$parent->_autocommit = true;
		
		$ret = $parent->Execute('ROLLBACK');
		return $ret;
	}


    // mark newnham
	function MetaColumns($tab,$normalize=true)
	{
	  global $ADODB_FETCH_MODE;

	  $parent = $this->pdoDriver;
	  $false = false;
	  $save = $ADODB_FETCH_MODE;
	  $ADODB_FETCH_MODE = ADODB_FETCH_ASSOC;
	  if ($parent->fetchMode !== false) $savem = $parent->SetFetchMode(false);
	  $rs = $parent->Execute("PRAGMA table_info('$tab')");
	  if (isset($savem)) $parent->SetFetchMode($savem);
	  if (!$rs) {
	    $ADODB_FETCH_MODE = $save; 
	    return $false;
	  }
	  $arr = array();
	  while ($r = $rs->FetchRow()) {
	    $type = explode('(',$r['type']);
	    $size = '';
	    if (sizeof($type)==2)
	    $size = trim($type[1],')');
	    $fn = strtoupper($r['name']);
	    $fld = new ADOFieldObject;
	    $fld->name = $r['name'];
	    $fld->type = $type[0];
	    $fld->max_length = $size;
	    $fld->not_null = $r['notnull'];
	    $fld->primary_key = $r['pk'];
	    $fld->default_value = $r['dflt_value'];
	    $fld->scale = 0;
	    if ($save == ADODB_FETCH_NUM) $arr[] = $fld;	
	    else $arr[strtoupper($fld->name)] = $fld;
	  }
	  $rs->Close();
	  $ADODB_FETCH_MODE = $save;
	  return $arr;
	}

	function MetaTables($ttype=false,$showSchema=false,$mask=false)
	{
		$parent = $this->pdoDriver;
		
		if ($mask) {
			$save = $this->metaTablesSQL;
			$mask = $this->qstr(strtoupper($mask));
			$this->metaTablesSQL .= " AND name LIKE $mask";
		}
		
		$ret = $parent->GetCol($this->metaTablesSQL);
		
		if ($mask) {
			$this->metaTablesSQL = $save;
		}
		return $ret;
   }
}
?>